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Re: Can this be done using CALL_FUNCTION? [message #19352 is a reply to message #19335]

Wed, 08 March 2000 00:00

edward.s.meinel
Messages: 12
Registered: May 1999

Junior Member

In article <38C53FCA.A89BD43E@astro.cornell.edu>,
"J.D. Smith" <jdsmith@astro.cornell.edu> wrote:
> edward.s.meinel@aero.org wrote:
>>
>> I am working with spectral images. Unfortunately, IDL is geared toward
>> multidimensional data in which all of the dimensions are the same type
>> (i.e. spatial, spectral, frequency...) but it doesn't like to operate
>> on data with mixed dimensions, such as a multispectral image.
>
> What is it about multi-spectral data that IDL doesn't like?

You answered your own question...

> It's up to
> you to keep track of which dimensions are which,

This gets to be a real pain after the umpteenth time of checking the
number of dimensions and setting up the different cases of TRUE.

> It certainly
> doesn't care about whether a single dimension of your data array
> represents spatial, temporal, or spectral changes...
> maybe I'm missing something.

No, IDL doesn't care about these issues when _creating_ the array, but
it certainly does care when _operating_ on the array.

> It is true that certain IDL routines operate on images, or require
> other specially formatted or dimensioned data, but how is it to know
> which dimensions you are interested in without specifically telling it?

Well, I was thinking about something along the lines of the example I
gave.

> Maybe you could give us an example in which this kind of generality
> would be useful.

I did. How about HISTOGRAM? FFT? Median filter? ...

Ed Meinel

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[Message index]

		Re: Can this be done using CALL_FUNCTION? By: davidf on Thu, 09 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: Struan Gray on Thu, 09 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: davidf on Thu, 09 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: edward.s.meinel on Thu, 09 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: davidf on Wed, 08 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: Struan Gray on Wed, 08 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: John-David T. Smith on Wed, 08 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: edward.s.meinel on Wed, 08 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: John-David T. Smith on Tue, 07 March 2000 00:00
		Re: Can this be done using CALL_FUNCTION? By: Martin Schultz on Tue, 07 March 2000 00:00

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